In this tutorial i will explain how to unlock iphone 4 4.3.5 using gevey sim technique onbaseband 04.10.01 , which requires no jailbreaking . Gevey Sim is a circuit which sits between your micro sim card and the phone by sliding in your sim slot as shown in the image below .

The black square which you see here is the (IC) integrated circuit which is programmed to unlock iPhone 4 following the unlock procedure explained in details below .